Explain the meaning of the entries in the matrix ab

Question

Questions of matrices.

Multiply:

3. Matrix A shows number of stocks holding by William and Michael:

A. Find AB.

B. Explain the meaning of the entries in the matrix AB.

4. Find inverse to the given matrix

                   2  3
                   3  5

5. Use Excel function MINVERSE to find inverse to the given matrix

                              1   -1    3
                              2    1    2  
                             -2    -2   1